两人世界变成三人拥挤不堪
[liăng rén shì jiè biàn chéng sān rén yōng jĭ bù kān]
'Two-person world turns into three, too crowded.' It portrays a sentiment of intimate tranquility turning into uncomfortable congestion once a third party intervenes, typically referencing changes in romantic or personal space dynamics leading to discomfort or complications.